Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"Underwater Communication"”.
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Underwater communication via compact mechanical sound generation
Effective communication with underwater remotely operated vehicles (UROV) can be difficult to accomplish. In water, simple radio communication is quickly dissipated at higher frequencies and lower frequencies require a large antenna, which may not be practical in all applications. Light can also be …
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Use of American Sign Language for Underwater Communication
… less anxiety and more self confidence, perform underwater tasks faster and perceive themselves safer and enjoying diving more because of their use of signs than two control groups without the use of signs.
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A Novel Chirp Slope Keying Modulation Scheme for Underwater Communication
… Keying (CSK) is developed for coherent underwater acoustic communications. Effective signal detection is a critical stage in the implementation of any communications system; we will see that CSK solves some significant challenges to reliable detection. This thesis is primarily based on …
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Underwater communication via particle velocity channels : principles, channel models, and system design
… and design of vector sensors. On the other hand, underwater acoustic communication systems have been relying on scalar sensors only, which measure the pressure of the acoustic field. By taking advantage of the vector components of the acoustic field, such as the particle velocity, the vector …
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Underwater acoustic communication over Doppler spread channels
This work is concerned with coherent communication by means of acoustic signals over underwater communication channels. The estimated scattering functions of real data ranging from the Arctic environment to tropical waters show that underwater communication channels can not be captured by a single, …
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Magnetic Communication in Harsh Environments Employing High-Sensitive Wideband Magnetic Field Sensors
… many transmission media other than air, current communication systems are unable to provide sufficiently fast and stable data transmission for modern applications. Examples include underground and underwater communication, as well as data transmission in process engineering, e.g., communication …
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Autonomous underwater data muling using wireless optical communication and agile AUV control
Underwater exploration and surveillance currently relies on subsea cables and tethers to relay data back to the user. The cause for this is that water heavily absorbs most electromagnetic signals, preventing effective radio communication over large distances, and that underwater communication with …
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The performance of directional flooding routing protocol for underwater sensor networks
The specific characteristic of underwater environment introduces new challenges for the networking protocols. Underwater Wireless Sensor Networks (UWSN) and terrestrial Wireless Sensor Networks (WSN) share some common properties but their differences too. These differences necessitate specialized …
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An Underwater Channel Model and Chirp Slope Keying Modulation Scheme Performance
… new and innovative digital modulation scheme for underwater data transmission. The underwater environment brings up several challenges to the manufacturing and operation of communication systems. This thesis shows through analysis and simulations the effectiveness of Chirp-Slope Keying (CSK) in …
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An Image Compression Approach to Cooperative Processing for Swarming Autonomous Underwater Vehicles
Current wireless underwater communication technologies—i.e. underwater acoustic modems—are extremely bandwidth limited as compared to land-based wireless technologies. Additionally, acoustic modem technologies are not advancing at the same high rate as computing technologies. Therefore, it is …
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Adaptive reception for underwater communications
… the development of an adaptive receiver for underwater communication. In this type of wireless link, the radio channel is replaced by an underwater acoustic channel, which is strongly dependent on the physical properties of the ocean medium and its boundaries, the link geometry and the …
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High-Dimensional Quantum Information: From Sensing to Underwater Quantum Communication
… of high-dimensional quantum states in communication, computing, and metrology. Specifically, this thesis explores the use of the high-dimensional Laguerre-Gaussian (LG) and vector vortex optical modes in underwater quantum communication channels. Making use of these high-dimensional …
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Sistemas de transmissão multiportadora aplicados em um canal acústico submarino na presença de efeito doppler
… transmission application in acoustic communication systems for underwater environment. Such analysis encompass (Single-Carrier Frequency Division Multiple Access) SC-FDMA, (Orthogonal Frequency Division Multiplexing) OFDM and (Frequency Shift Keying) FSK systems, with either Zero …
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Controller design for underwater vehicle systems with communication constraints
… or environmental feature, but relies on wireless communications. Underwater communication is almost exclusively accomplished through acoustics, which bring challenges such as delays, low data rates, packet loss, and scheduling constraints. To address these challenges, this thesis presents …
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A super-nyquist architecture for rateless underwater acoustic communication
… they contain, much of them remain unexplored. Underwater communication plays a key role in the area of deep ocean exploration. It is also essential in the field of the oil and fishing industry, as well as for military use. Although research on communicating wirelessly in the underwater …
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Amphibian communication: Coupling of acoustic systems to the medium at the air-water interface
… have evidence suggesting simultaneous acoustic communication both above and below the air-water interface. This thesis addresses whether the female túngara frog would be receptive to underwater acoustic signals and if males project their advertisement calls at biologically relevant intensities …
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Communication and time distortion
Communication systems always suffer time distortion. At the physical layer asynchrony between clocks and motion-induced Doppler effects warp the time scale, while at higher layers there are packet delays. Current wireless underwater modems suffer a significant performance degradation when …
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Wireless Systems for a Sustainable Future: From Battery-Free Subsea IoT to THz-Based Agriculture Monitoring
… ways to unlock new capabilities in underwater climate monitoring, food safety, and disaster response. The thesis introduces two novel technologies. The first technology enables long-term, ultra-low power ocean sensor networks for use in climate modeling, marine monitoring, and …
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Battery-Free Subsea Internet-of-Things
… (e.g, Bluetooth, WiFi, GPS) cannot operate underwater, which has left 70% of our planet (the ocean) beyond their reach. In this thesis, I describe how we can change this reality by introducing IoT technologies that are inherently designed for the ocean. Specifically, I show how by rethinking …
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Controller design for underwater vehicle systems with communication constraints
… or environmental feature, but relies on wireless communications. Underwater, communication over distances beyond about one hundred meters is almost exclusively accomplished through acoustics, which bring challenges such as propagation delays, low data rates, packet loss, and scheduling constraints …
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